GPT-6 Luna vs Grok 4.7
Grok 4.7 leads overall, C- to D. GPT-6 Luna is about 60x cheaper per task. By suite, GPT-6 Luna takes real-world issues (D+ to D) and Grok 4.7 takes spec planning (C to C-). Take GPT-6 Luna anyway when you want the side that is cheaper per task, faster on real-world issues and ahead on real-world issues.Measured
Each agent graded on the same private suites, running headless through its own tools. Advantages are oriented so a win is a win, whichever way the metric runs.
Verdict: Grok 4.7 vs GPT-6 Luna
Grok 4.7 leads overall, C- to D. By suite: GPT-6 Luna takes real-world issues, D+ to D (50% vs 47% capability); Grok 4.7 takes spec planning, C to C- (68% vs 61% capability); Grok 4.7 takes vibe coding, C to F (64% vs 33% capability). GPT-6 Luna used 1% of ChatGPT Plus's weekly limit per pass, $0.002 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~0.2% of ChatGPT Pro 5x's weekly limit (est, about $0.002 per task). Grok 4.7 used 12% of SuperGrok Plus's weekly limit per pass, $0.145 per task at the listed price. Per task, GPT-6 Luna is about 60x cheaper ($0.002 vs $0.145). GPT-6 Luna is faster on real-world issues: a median task takes 1m 0s against 6m 57s. Both finished every task on it. Reasons to pick GPT-6 Luna anyway: it is cheaper per task ($0.002 vs $0.145), it is faster on real-world issues (1m 0s vs 6m 57s median) and it leads on real-world issues (D+ to D).
| Dimension | GPT-6 Luna | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 50% | 47% | +3% (GPT-6 Luna leads) |
| Median task time | 1m 0s | 6m 57s | 5m 57s faster (GPT-6 Luna leads) |
| Approx. task cost | $0.003 / task | $0.077 / task | $0.074 / task lower (GPT-6 Luna leads) |
GPT-6 Luna: 1.0% of ChatGPT Plus (1.0% / 5h, 1.0% / 1w) per run. Its weekly limit holds about 6 of the week's 33.6 5h windows. Grok 4.7: 5.0% of SuperGrok Plus (5.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | GPT-6 Luna | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 61% | 68% | +8% (Grok 4.7 leads) |
| Median task time | 1m 8s | 37m 24s | 36m 16s faster (GPT-6 Luna leads) |
| Approx. task cost | <$0.011 / task | $0.402 / task | $0.391 / task lower (GPT-6 Luna leads) |
GPT-6 Luna: under 1% of ChatGPT Plus per run. Its weekly limit holds about 6 of the week's 33.6 5h windows. Grok 4.7: 7.0% of SuperGrok Plus (7.0% / 1w) per run. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | GPT-6 Luna | Grok 4.7 | Advantage |
|---|---|---|---|
| Capability | 33% | 64% | +31% (Grok 4.7 leads) |
| Median task time | 1m 37s | 11m 10s | 9m 33s faster (GPT-6 Luna leads) |
| Approx. task cost | not measured | $0.092 / task | - |
GPT-6 Luna: under 1% of ChatGPT Plus (0.4% / 5h) per good solve. Its weekly limit holds about 6 of the week's 33.6 5h windows. Grok 4.7: 0.4% of SuperGrok Plus (0.4% / 1w) per good solve. Each figure is a share of that agent's own plan, so there is no delta to draw.
Grades and deltas are comparable only within a suite version. See methodology.
Frequently asked questions
Which is better for coding, GPT-6 Luna or Grok 4.7?
Grok 4.7 clears higher: tier 4 of 5 versus tier 2 for GPT-6 Luna on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-23.
Which is cheaper per task, GPT-6 Luna or Grok 4.7?
GPT-6 Luna used 1% of ChatGPT Plus's weekly limit per pass, $0.002 per task at the listed price; at the ~$100 tier the board defaults to that is an estimated ~0.2% of ChatGPT Pro 5x's weekly limit (est, about $0.002 per task). Grok 4.7 used 12% of SuperGrok Plus's weekly limit per pass, $0.145 per task at the listed price. Per task, GPT-6 Luna is about 60x cheaper ($0.002 vs $0.145).
What do GPT-6 Luna and Grok 4.7 cost a month?
GPT-6 Luna runs on ChatGPT Plus at $20/month (public price as of 2026-07-20). Grok 4.7 runs on SuperGrok Plus at $100/month (public price as of 2026-09-14).